PeachParts Mercedes-Benz Forum - View Single Post - 450SLC after years in the garage runs roughly

G-Benz · #2 10-14-2003, 03:40 PM

My first guess would be a vacuum leak of some kind.

Vacuum hoses follow the same physical laws of entropy and as they age they get brittle and lose their sealing capabilities. But you probably have an intake manifold leak of some sort as well.

The long cranking times indicate that you are losing fuel pressure. I don't know much about your engine configuration or the associated components, but there is probably a fuel component (accumulator or regulator, I can't remember) that maintains fuel and pressure when the engine is not running. This allows for quick starts when cold. If the component is not doing its job, you have to crank the car several times on a cold start to build up the fuel pressure again.

These are not the wise words of an experienced tech, but some suggestions on where to start looking...good luck!